Mandrel for forming and vulcanizing rubber hose.



S. J. SILL.

MANDRBL FOR FORMING AND VULGANIZING RUBBER HOSE.

APPLICATION FLED JAN. 2. 1013,

Patented Mar. 2, 1915.

'UNITED STATES PATENT OFFICE.

SAMUEL J'. SILL, 0F BUFFALO, NEW YORK, ASSIGNOR ONE-HALF '10 HERBERT H. HEWITT, OF BUFFALO, NEW YORK.

MANDBEL FOR FORMING AND VULCANIZING RUBBER HOSE.

Application led January 2, 1913.-

To all lwhom it may concern Be it known that I, SAMUEL J. SILL, a citizen of they United States, and a resident of Buffalo, county of Erie, and State of New York, have invented certain new and useful Improvements in Mandrels for Forming and Vulcanizing Rubber Hose, of which the following is -a full, clear, and exact description.

The invention relates to mandrels whereon short lengths of rubber hose, such as are employed in railway airbrake systems, are formed and vulcanized. Such rubber hose is connected at its ends to metalcouplin s, the nipples of which are inserted in en arged ends of the hose. Usually the ends ofthe hose are enlarged after the hose has been formed. This practice of enlarging thel necessarily subjected to the greatest amountof wear.

The present inventionseeks to provide an improved mandrel upon which the lengths of hose are formed and vulcanized and which provides the lengths of hose with enlarged ends during the rocess of manufacture, and which will also provide the desired square finish to the end faces of the hose.

The improvement consists in the features of construction hereinafter set forth, illustrated in the preferred form in the accompanying drawings, and morey particularly pointed out in the appended claims.

In the drawings,-Figure 1 is an.Y elevation of the improved mandrel with a hose section thereon; Fig. 2 is a longitudinal sectionlthereof taken on the line 2 2 of Fig. 1; Fig. 3 is a view of the left-hand end of the mandrel; Figs. 4 and 5 are cross sections on the lines 4.--4 and 5 5, respectively, of Fig. 1; and Fig. 6 is a vidw of the right-hand end of the mandrel.

The body 1 of the improved mandrelv is formed of iron or steel, and is preferably hollow to reduce its wei ht. At one end it is provided with a slight y enlar ed portion 2. The mandrel is convenient y formed from a' piece of wrought-iron or steel pipe, which is turned to form the enlarged portion 2 and the reduced body 1 thereof. A terminal collar 3 is fitted over the end of Specification of Letters Patent.

Patented Mar. 2, 1915.

SeriaI N o. 739,878.

the enlarged portion 2, and is fixed in position by a cross pin 4, or in any other suitable manner.

At its opposite end the mandrel is provided with an axially projecting stem 5 of reduced-diameter. The outer end of the stem is provided with a threaded portion 6 slightly reduced in diameter, and, at its inner end, the stem is provided with an enlarged head or plug 7 which lits within the adjacent end of the hollow mandrel and is firmly secured thereto in any suitable manner. A sleeve 8 fits over the stem 5 and abuts against the adjacent end of the body portion 1 of the mandrel. The outer end of the bore of the sleeve is threaded to engage the threaded portion 6 of the stem and therebv detachably secure the sleeve in position. The main body portion of the sleeve 8 corresponds in diameter to the enlarged portion 2 at the opposite end of the mandrel, and these parts serve to form the enlarged ends of the hose section.

The sleeve 8 is provided at its outer end with a collar 9, which is preferably integral therewith. This collar is of the same diameter as the collar 3 at the opposite end of the mandrel, and these parts form square shoulders 10 against which the end faces of the hose section are formed. The sides of the collars 3 and 9 adjacent their ends are provided with flattened faces 11, so that these parts may be engaged by suitable chucks, wrenches or like tools for unscrewing the sleeve 8 and collar 9 and for replacing the same in position.

n using the improved mandrel, the sleeve 8 with the collar 9 thereon are removed and a core or tube 12 of raw rubber is slipped over the mandrel. The parts 8 and 9 are then replaced in position. If desired, the

core 12 of raw rubber may be formed of a' narrow sheet wrapped about the mandrel. This core or tube extends over the bod portion 1 of the mandrel and over the en arged portion 2 thereof, and also over the sleeve 8, the ends of the core abutting against the shoulders llrof the collars '3 and 9. Layers or plies 13 of suitable fabric are then wrapped about the rubber core 12 on the mandrel. Preferably a sheet of frictioned duck is smoothly wrapped about the rubber core 12 in a suitable wrapping machine, in which the mandrel is placed, the duck being drawn snugly over the enlarged portions 2 and 8 and having itsside edges snugly engaging the shoulders 10. Thereafter a narrow strip of raw rubber is Wrapped upon the fabric 13 to form an vouter protecting layer 14, the ends of which abut snugly against the shoulders 10.

After the hose section is formed onthe mandrel, as described, it is preferably wrapped with wet cloths and subjected to the vulcanizing or curing process. After vulcanizing, the sleeve 8, with the collar 9 thereon, is removed, preferably by placing the mandrel between a pair of chuck heads which are provided with suitable recesses for receiving the flattened end portions of the collars v3 and 9. One of the chuck heads is then rotated to unscrew and remove the sleeve 8. The finished hose is then removed from the mandrel.

By using the improved mandrel the hose section is provided with enlarged ends during its process of manufacture and before vulcanization, so that it is unnecessary to subsequently enlarge or weaken its ends. The length of the hose is accurately determined by the shoulders 10 of the collars 3 and 9, and these shoulders form square end faces upon the hose section.

It is obvious that changes may be made from the details set forth without departure from the essentials of the invention as delined in the claims.

I claim as my invention:

1. A mandrel for forming rubber hose comprising a cylindrical body having enlarged cylindrical end portions on which said hose is formed and terminal collars' forming abutments over the ends `of said hose, one enlarged end portion and the adjacent collar being detachable from the body of the mandrel to permit the removal of said hose, substantially as described.

2. A mandrel forV forming rubber hose comprising a cylindrical body having an enlarged portion at one end and a reduced stem at its opposite end, and a sleeve corresponding in size to said enlarged portion detachably mounted on said stem, said enlarged portion and said sleeve having terminal collars thereon, substantially as described.

3. A mandrel for forming rubber hose comprising a cylindrical body having an enlarged cylindrical portion at one end and a reduced threaded stem at its opposite end, and a cylindrical sleeve correspondin in size to said enlarged portion threade r on said stem, said enlarged ortion and said sleeve having terminal co lars thereon and flattened wrench-engaging faces, substantially as described.

SAMUEL J. SILL.

Witnesses:

EUGENE J. COLEMAN, GEORGE D. PLUMs'rmn. 

